They fought at Cassino and for the russians (less their officers) on the Eastern Front. A Polish manned cruiser of the RN was scuttled to help form the breakwater of the artifical harbour at Normandy
A total of 249000 Poles fought in the Army with manpower derived from the following sources
Deserters from the German Wehrmacht 89,300
Evacuees from the USSR in 1941 83,000
Evacuees from France in 1940 35,000
Liberated POWs 21,750
Escapees from occupied Europe 14,210
Recruits in liberated France 7,000
Polonia from Argentina, Brazil and Canada 2,290
Polonia from the United Kingdom 1,780
Until July 1945, when recruitment was halted, some 26,830 Polish soldiers were declared KIA or MIA or had died of wounds. After that date, an additional 21,000 former Polish POWs were inducted.
After the country's defeat in the 1939 campaign, the Polish government in exile quickly organized in France a new army of about 80,000 men. In 1940 a Polish Highland Brigade took part in the Battle of Narvik (Norway), and two Polish divisions (First Grenadier Division, and Second Infantry Fusiliers Division) took part in the defense of France, while a Polish motorized brigade and two infantry divisions were in process of forming. A Polish Independent Carpathian Brigade was formed in French-mandated Syria, to which many Polish troops had escaped from Romania. The Polish Air Force in France comprised eighty-six aircraft in four squadrons, one and a half of the squadrons being fully operational while the rest were in various stages of training.
After the fall of France, numbers of Polish personnel had died in the fighting (some 6,000) or been interned in Switzerland (some 13,000). Nevertheless, General Władysław Sikorski, Polish commander-in-chief and prime minister, was able to evacuate many Polish troops to the United Kingdom. In 1941, following an agreement between the Polish government in exile and Joseph Stalin, the Soviets released Polish citizens, from whom a 75,000-strong army was formed in the USSR under General Władysław Anders. Without any support from the Soviets to train, equip and maintain this army, the Polish government in exile followed Anders' advice for a transfer of some 80,000 (and around 20,000 civilians), in March and August 1942, across the Caspian Sea to Iran. In the Middle East, this "Anders' Army" joined the British 8th army, where it became the Polish II Corps.
The Polish Air Force first fought in 1939 against the german aggression into Poland (Case White). Outnumbered and with its fighters outmatched by more advanced German fighters, as mentioned previously, the PAF inflicted significant damage out of proportion to its numbers on the Luftwaffe. The Luftwaffe lost, to all operational causes, 585 aircraft, while the Poles lost 333 aircraft.
After the fall of Poland many Polish pilots escaped via Hungary to France. The Polish Air Force fought in the Battle of France as one fighter squadron GC 1/145, several small units detached to French squadrons, and numerous flights of industry defence (in total, 133 pilots, who achieved 53-57 victories at a loss of 8 men in combat, what was 7,93% of allied victories).
Later, Polish pilots fought in the Battle of Britain, where the Polish 303 Fighter Squadron claimed the highest number of kills of any Allied squadron. From the very beginning of the war, the Royal Air Force (RAF) had welcomed foreign pilots to supplement the dwindling pool of British pilots. On 11 June 1940, the Polish Government in Exile signed an agreement with the British Government to form a Polish Army and Polish Air Force in the United Kingdom. The first two (of an eventual ten) Polish fighter squadrons went into action in August 1940. Four Polish squadrons eventually took part in the Battle of Britain (300 and 301 Bomber Squadrons; 302 and 303 Fighter Squadrons), with 89 Polish pilots. Together with more than 50 Poles fighting in British squadrons, a total of 145 Polish pilots defended British skies. Polish pilots were among the most experienced in the battle, most of them having already fought in the 1939 September Campaign in Poland and the 1940 Battle of France. Additionally, prewar Poland had set a very high standard of pilot training. The 303 Squadron, named after the Polish-American hero, General Tadeusz Kościuszko (and the highest mountain in Australia), claimed the highest number of kills (126) of all fighter squadrons engaged in the Battle of Britain, even though it only joined the combat on August 30, 1940. These Polish pilots, constituting 5% of the pilots active during the Battle of Britain, were responsible for 12% of total victories in the Battle.
126 German aeroplanes shot down by the 303 squadron during the Battle of Britain. The Polish Air Force also fought in 1943 in Tunisia (Polish Fighting Team, so called "Skalski's Circus") and in raids on Germany (1940–45). In the second half of 1941 and early 1942, Polish bomber squadrons were the sixth part of forces available to RAF Bomber Command (later they suffered heavy losses, with little replenishment possibilities). Polish aircrew losses serving with Bomber Command 1940-45 were 929 killed. Ultimately 8 Polish fighter squadrons were formed within the RAF and had claimed 629 Axis aircraft destroyed by May 1945. By the end of the war, around 19,400 Poles were serving in the RAF.
Polish squadrons in the United Kingdom:
No. 300 "Masovia" Polish Bomber Squadron (Ziemi Mazowieckiej)
No. 301 "Pomerania" Polish Bomber Squadron (Ziemi Pomorskiej)
No. 302 "City of Poznań" Polish Fighter Squadron (Poznański)
No. 303 "Kościuszko" Polish Fighter Squadron (Warszawski imienia Tadeusza Kościuszki)
No. 304 "Silesia" Polish Bomber Squadron (Ziemi Śląskiej imienia Ksiecia Józefa Poniatowskiego)
No. 305 "Greater Poland" Polish Bomber Squadron (Ziemi Wielkopolskiej imienia Marszałka Józefa Piłsudskiego)
No. 306 "City of Toruń" Polish Fighter Squadron (Toruński)
No. 307 "City of Lwów" Polish Fighter Squadron (Lwowskich Puchaczy)
No. 308 "City of Kraków" Polish Fighter Squadron (Krakowski)
No. 309 "Czerwien" Polish Fighter-Reconnaissance Squadron (Ziemi Czerwieńskiej)
No. 315 "City of Dęblin" Polish Fighter Squadron (Dębliński)
No. 316 "City of Warsaw" Polish Fighter Squadron (Warszawski)
No. 317 "City of Wilno" Polish Fighter Squadron (Wileński)
No. 318 "City of Gdansk" Polish Fighter-Reconnaissance Squadron (Gdański)
No. 663 Polish Artillery Observation Squadron
Polish Fighting Team (Skalski's Circus){attached to No. 145 Squadron}
No. 138 Special Duty Squadron Polish Flight "C"
No. 1586 Polish Special Duty Flight
For the navy on the eve of war, three destroyers — representing most of the major Polish Navy ships - had been sent for safety to the British Isles (Operation Peking). There they fought alongside the Royal Navy. At various stages of the war, the Polish Navy comprised two cruisers and a large number of smaller ships. The Polish navy was given a number of British ships and submarines which would otherwise have been unused due to the lack of trained British crews. The Polish Navy fought with great distinction alongside the other Allied navies in many important and successful operations, including those conducted against the German battleship, Bismarck. During the war the Polish Navy, which comprised a total of 27 ships (2 cruisers, 9 destroyers, 5 submarines and 11 torpedo boats), escorted 787 convoys, conducted 1,162 patrols and combat operations, sank 12 enemy ships (including 5 submarines) and 41 merchant vessels, damaged 24 more (including 8 submarines) and shot down 20 aircraft. 450 seamen out of the over 4,000 who served with the Navy lost their lives in action.
Cruisers: Dragon– Dragoon (British Danae class), Conrad (British Danae class)
Destroyers: Wicher– Gale (Wicher class) sunk September 1939, Burza– Storm (Wicher class), Grom– Thunder (Grom class) sunk 1940, Błyskawica– Lightning (Grom class), Garland (British G class) Orkan (British M-class destroyer Myrmidion) sunk 1943, Ouragan, sometimes called Huragan– Hurricane (French Bourrasque class), Piorun– Thunderbolt (British N class),
Escort destroyers: Krakowiak– Cracovian (British Hunt class) 1941–1946, Kujawiak– Kujawian (British Hunt class), Ślązak– Silesian (British Hunt class)
Submarines: Orzeł– Eagle (Orzeł class) lost 1940, Sęp– Vulture (Orzeł class) interned Sweden, Jastrząb– Hawk (British S class), Wilk– Wolf (Wilk class) to reserve 1942, Ryś– Lynx (Wilk class) interned Sweden, Żbik– Wildcat (Wilk class) interned Sweden, Dzik– Boar (British U class) 1942–1946
Sokół– Falcon (British U class) 1941–1945
Heavy minelayers: Gryf– Griffin (Gryf class) sunk 1939
Light minelayers ("ptaszki"– "Birds"): Jaskółka– Swallow, sunk 1939
ORP Mewa– Seagull
ORP Rybitwa– Tern
ORP Czajka– Lapwing
ORP Żuraw– Crane
ORP Czapla– Heron
The Polish River Fleet
A number of minor ships, transports, merchant-marine auxiliary vessels, and patrol boats. Polish Merchant Navy contributed about 137,000 BRT to Allied shipping; losing 18 ships (with capacity of 76,000 BRT) and over 200 sailors during the war